Ladder



Mar. 3. 1925.

. F. ROBERTSON LADDER 2 Sheets-Sheet 2 Filed Agg. 19; 1922 ATT'ORNEY WITNESS:

Patented Mar. 3, 1925'.

UNIT-ED STATES PATENT oFFlcs.

FRANK ROBERTSON, OF NEW ORLEANS, LOUISIANA, ASSIGNOR OF ONE-HALF TO BENJAMIN HART, OF NEW ORLEANS, LOUISIANA.

LADDER.

Application filed August 19, 1922. Sera1-No-- 582,918.

Toy all whom t may concer/a:

Be it knownthat I, FRANK ROBERTSON, a

citizen of the United States, residing at N ew v Orleans, in the` parish of Orleans -and State ofLouisianznhave invented new and useful Improvements in Ladders, of which the following v isV a; specilication! This vinvention relates to extension .ladders and has for an object the provision of meanswhereby the height of a ladder may be easily and quickly regulated.

Another object of the invention is the provision of an extension step ladder, wherein both the step sections and the brace are adjusted to regulate the height of the ladder platform, novel meansl being provided for holding the step sections and the brace sections in adjusted position.

With the above and other objects in View, the invention further includes the following novel features and details of construction, to be hereinafter more fully described, illustrated in the accompanying drawings and po-inted out in the appended claim.

In the drawings j Figure 1 is a front elevation of a ladder constructed in accordance with the invention.

Figure 2 is a rear elevation of the same.

Figure 3 is a side elevation.

Figure 4 is a horizontal section on the line 4-4 of Figure 3.

Figure 5 is an enlarged vertical section through the ladder showing the means for holdingthe ladder sections extended.

vFigure 6 is a similar view of the brace sections.

Referring in detail to the drawings, wherein like characters of reference denote corresponding parts, the invention as shown comprises step sections 10 and 11, each of which include side rails 12 and rungs 13. The Section 1() is secured to a platform 14, as shown at 15, while the section 11 is slidingly mounted upon the section 10. For this purpose each of the side rails of each section carries a substantially L-shaped arm 16, two of which are secured to the upper end of the side rails of one section, while two are secured to the lower ends of the side rails of the other section. The arms 16 are located upon the outside of the side rails 12, while the inside of each of the side rails of the tion.

lsection 11 has secured thereto an arm 17,

which extends over and engages the inner face of the side rail of the other step sec- The sections 10 and 11 are thus capable of relative sliding movement so as to permit the ladder to be adjusted and in order to hold the latter in adjusted position, each of the `side rails l2 of the step section 1l has pivotally secured thereto as shown at 18, one arm of a bracket 19. The outer end of this arm extends across the inner face of the side rail of the other step section 10 and is formed to provide a seat 2O for the reception of the rungs 13 of the said step section 10. The opposite end of the bracket 19 is curved to provide a rung engaging seat 2l, while at its extremity the bracket is provided with an eye 22. A connecting rod 23 engages the eyes 22 of each of the lbrackets 19 so as to provide an operating handle and to insure simultaneous pivotal movement of the bracket, while a brace rod 24 serves as an additional means for connecting and bracing the brackets.

When the ladder is being extended, the brackets 19 will engage the rungs of the step section l0 and will drop by gravity, their limit of downward movement being regulated by the engagement of the stops 21 with the rungs of the ladder section 11. As`

soon as the sections are extended the desired length, a slight inward movement will cause the rungs of the step section 10 to engage the seats of the brackets 19 so as to hold the sections against further collapsing movement. When fully collapsed, the sections are held against accidental extension by means of hooks 25 which are carried by the section 10 and engage eyes 25 carried by the section 11,

The brace of the ladder is also of sectional formation and includes an upper section 26 and a lower section 27, which are slidingly connected together by means of substantially L-shaped arms 28 which are located upon the outside of the side rails 29 of theupper brace section and arms 30 which are located upon the inside of said side rails, after the manner of the arms 16 and 17j Pivotally secured to the side rails of the brace section 27, as shown at 31 are yokes 3.2. These yokes include spaced substantially parallel arms which are positioned upon opposite sides of the side rails 29 of the brace section 2T and are provided at one end with an eye 33 which is engaged by the opposite ends of a combined connecting and operating rod 34, whereby the yokes may be simultaneously moved. The opposite ends of the arms of these yokes have positioned therebetween a roller 35, which is adapted to drop into spaced notches 86 provided in the side rails 29 of the brace section 26. These rollers will drop by gravity into the notches and will hold the brace sections in extended position.

The platform let provided with a hook 37 which is adapted to engage the lower brace section 2T to hold the same in collapsed position.

The invention is susceptible of various changes in its form. proportions and minor details of construction and the right is herein reserved to make such changes as properly fall within the scope of the appended claim.

Having described the invention what is claimed is:-

An extension ladder embodying separate step sections including side rails and rungg connecting the side rails, means connecting the sections to permit relative sliding movement, substantially V-shaped brack ets having one of their ends pivotally secured to the inner faces of said rails of one section, the opposite ends of the brackets being curved to engage over a rung of the last referred to section and terminating in eyes, a horizontal handle having its ends engaged in the eyes, seat provided in each bracket adjacent the apex of the V for engagement beneath an adjacent rung of the other step section, the apices of the brackets terminating in eyes, and arod engaged in said eyes and having its ends arranged between the side bars of the adjacent step section.

in testimony whereof I affix my signature.

FRANK ROBERTSON. 

